fix(generator): do not copy schema file if generating to the current dir

[RobertCraigie]

Change Summary

Fixes #513.

Checklist

• Unit tests for the changes exist
• Tests pass without significant drop in coverage
• Documentation reflects changes where applicable
• Test snapshots have been updated if applicable

Agreement

By submitting this pull request, I confirm that you can use, modify, copy and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Base: 94.32% // Head: 94.33% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (0e2536c) compared to base (c436345).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
+ Coverage   94.32%   94.33%   +0.01%     
==========================================
  Files         120      120              
  Lines        6059     6073      +14     
  Branches     1037     1039       +2     
==========================================
+ Hits         5715     5729      +14     
  Misses        301      301              
  Partials       43       43              

Impacted Files	Coverage Δ
src/prisma/generator/generator.py	91.27% <100.00%> (+0.11%)	⬆️
tests/test_generation/test_generator.py	100.00% <100.00%> (ø)
tests/test_client.py	100.00% <0.00%> (ø)
src/prisma/_compat.py	100.00% <0.00%> (ø)

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